<International Circulation>: Warfarin therapy is challenging because there is wide variation among patients in response and therefore in dose requirement. There are some reports on genetic testing to help predict the patient’s response to warfarin therapy. What are the benefits and risks of genetic testing before prescribing warfarin?

Prof. Diener: That is not applicable for those people who have had arterial stroke because you can not wait until you have results of the genetic testing to decide to put someone on anticoagulation or not.